New calcineurin inhibiting 3-dimethylaminopropyl substituted diarylheterocycles by sonogashira reactions and catalytic hydrogenation
作者:Lunxiang Yin、Jürgen Liebscher、Frank Erdmann
DOI:10.1002/jhet.5570420717
日期:2005.11
A series of calcineurininhibiting compounds 1 consisting of a central aromatic N-heterocycle, two aryl substituents and a 3-dimethylaminopropyl chain was synthesized by introduction of the side chain. A corresponding haloheterocycle 3 was transformed into a 3-dimethylaminopropynylheterocycle 2 by Sonogashira coupling and was in turn hydrogenated in the presence of Pd/C to afford the 3-dimethylami
Palladium-Catalyzed Cross-Coupling Reactions of 7-Bromo-2,3-diphenylpyrido[2,3-<i>b</i>]pyrazine
作者:Jürgen Liebscher、Lunxiang Yin
DOI:10.1055/s-2005-861871
日期:——
First examples of palladium-catalyzed cross-coupling reactions, such as Suzuki, Sonogashira, Heck and Buchwald-Hartwig reactions, are reported in the pyrido[2,3-b]pyrazine series. This methodology circumvents problems found in uncatalyzed nucleophilic substitution used so far to introduce substituents into the pyrido[2,3-b]pyrazine ring.